26 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. XXXIV, 



The incubatory plates are much smaller than in the adult, and the 

 marsupial pouch greatly reduced in size. The pouch is never filled 

 with eggs at this stage. (See fig. 4.) 



Description of male.— Body narrow, elongate. 

 Color yellow. (See fig. 5.) 



Head but little wider than long; frontal margin 

 straight, with antero-lateral angles rounded. Pos- 

 terior portion somewhat wider than anterior. Eyes 

 wanting. First pair of antennae composed of three 

 joints, second pair composed of seven, the last two 

 being minute and tipped with hairs. 



The seven thoracic segments are separated from 

 each other by lateral incisions, so that the lateral 

 margins are not continuous. There are seven pairs 

 of prehensile legs. 



The six abdominal segments are perfectly dis- 

 tinct, are separated from each other by lateral 

 incisions, and decrease gradually in width from 

 the first to the sixth, which carries a pair of 

 elongated, tapering appendages, the uropoda. The pleopoda are 

 rudimentary. 



Fig. 5.— Leidya dis- 

 torta. Male, a x 23. 



° Some allowance must be made for Leidy's figures, which are somewhat 

 diagrammatic. 



